Musnad Ahmad 28:500

Surayj narrated to us, Abdullah ibn al-Mu'ammal narrated to us, from Ata' ibn Abi Rabah, from Abdullah ibn Amr ibn al-Aas, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The Corner [the Black Stone] will come on the Day of Resurrection, greater than Mount Abu Qubays, having a tongue and two lips."